The global housing affordability crisis, explained

Housing affordability has deteriorated in most advanced economies over the past three decades. The result is a generation of younger adults who, in many cities, cannot afford to buy a home at any stage of a working life on a median wage. This is not a natural disaster. It is the outcome of a set of policy choices, demographic trends, and financial dynamics that are now well understood, even if the solutions remain politically contentious.

Why housing became so expensive

Several forces have worked together. On the supply side, planning and zoning rules in many cities have restricted the construction of new homes, particularly high-density housing close to jobs and services. Community opposition to new development, often from existing property owners, has been effective at slowing approvals. Construction costs have risen. On the demand side, growing populations (driven by natural increase and migration in many cities), declining household sizes (more people living alone or in smaller groups), and a long period of low interest rates that made mortgage finance cheap all pushed more money into housing markets. Low interest rates in particular increased the price buyers could afford to pay without reducing their monthly repayment, lifting values sharply in cities with constrained supply.

The financial dimension

Housing has also become an investment asset class in a way it was not historically in many countries. Tax treatment in several nations, including Australia, has made residential property an attractive investment, drawing in buyers beyond owner-occupiers. Institutional investors and short-term rental platforms have absorbed housing stock in some markets. When housing functions primarily as an investment, its price is determined not just by the cost of providing shelter but by the expected return relative to alternatives, which can drive prices well above what incomes would otherwise support.

Who is hurt and how

The consequences fall unevenly. Existing property owners have seen their wealth grow substantially. Renters, younger households, and those without family wealth to draw on face a more difficult path to ownership and often spend a high proportion of income on rent, leaving less for saving, health, or education. Cities with extreme housing costs have experienced workforce shortages, long commutes, homelessness, and the exit of lower-income residents to outer suburbs or other regions. The intergenerational wealth divide that housing has created has political consequences as well as economic ones.

What it means for Australia

Australia's housing affordability challenge is among the most acute in the OECD. Sydney and Melbourne consistently rank among the least affordable cities globally relative to local incomes. The causes are the same mix found elsewhere: restrictive planning in inner areas, a tax system that has historically favoured investors, high demand from population growth, and a prolonged period of low interest rates. State and federal governments have introduced a range of measures including first-home owner grants, shared equity schemes, and planning reform efforts, with mixed results. The Reserve Bank of Australia monitors housing as a financial stability risk as well as an economic one. Housing costs are a direct driver of rental inflation that feeds into the broader price level, linking the housing market to monetary policy.

The bottom line

Housing affordability is a structural problem with structural solutions, chiefly more supply in the right places and tax settings that do not inflate demand beyond what incomes can support. The obstacle is not knowledge but political difficulty.

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